In this paper,three practical criteria are given to deal with systems with selfincreasing difficulty under the guidance of spiral promotion methodology.They are suitable respectively for determinant information systems,stochastic information systems and state dependent systems.Another scheme with the functions of study,exploration,servo,adaptation and rational selection is also put forward to treat incomplete information systems.These criteria and scheme may contribute to seizing the opportunities of spire or promotion.In addition,a typical model is developed to explain that the investment of subjective ability should be properly controled,otherwise chaos may appear in a spiral promotion system.